Pressure-Sensitive Adhesives for the Attachment of Reinforcing Canvases to the Back of Paintings

Abstract

In the conservation of paintings on canvas, the original support can be consolidated by attaching a reinforcing fabric to the back of the painting. Some of the risks inherent in traditional lining techniques can be eliminated by the use of a pressure-sensitive adhesive. Adhesives based on acrylic esters were chosen for the present study because of their long-term stability. The adhesives were subjected to thermo-oxidative aging and changes in their chemical properties and their surface and adhesive properties were studied using Fourier transform mfrared (FTIR) spectrophotometry, goniometry and peel tests at 180°. The results indicate that thermo-oxidative aging causes three types of alteration in the adhesives: dehydration, oxidation and cross-linking. Although the extent of these phenomena is small, the loss of adhesive properties is significant, due to changes in the viscoelastic properties of the glues. However, some of the adhesives retain properties which satisfy the criteria required in conservation.

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